Retractable Cell Phone Antenna for Sanyo SCP-3100/2400 - Is reception on your Sanyo SCP-3100/SCP-2400 not as good as it used to be? Then perhaps a Retractable Cell Phone Antenna for Sanyo SCP-3100/2400 will solve your problem! Replacement antennas are an economic solution to a failing Sanyo SCP-3100/SCP-2400. Easily replace your phone's antenna and stay connected to all your contacts.